US4432881A - Water-dispersible hydrophobic thickening agent - Google Patents
Water-dispersible hydrophobic thickening agent Download PDFInfo
- Publication number
- US4432881A US4432881A US06/232,327 US23232781A US4432881A US 4432881 A US4432881 A US 4432881A US 23232781 A US23232781 A US 23232781A US 4432881 A US4432881 A US 4432881A
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- water
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- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/926—Packer fluid
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- Y10S507/00—Earth boring, well treating, and oil field chemistry
- Y10S507/935—Enhanced oil recovery
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Definitions
- This invention relates to thickening agents containing water-dispersible polymers which agents are used to increase the viscosity of aqueous media.
- a water-soluble polymer include polyacrylamide, acrylamide/acrylic acid copolymer, sodium polyacrylate, carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose, polysaccharide as well as naturally occurring gums such as guar gum and chemically modified gums such as hydroxypropyl guar gum.
- ionic water-soluble polymers such as neutralized acrylamide/acrylic acid copolymer, sodium polyacrylate, polystyrene sulfonate and the like are more efficient thickeners in deionized water than their nonionic counterparts, their thickening ability is greatly reduced by the presence of electrolytes such as sodium chloride, calcium chloride and magnesium sulfate in the aqueous medium.
- electrolytes such as sodium chloride, calcium chloride and magnesium sulfate in the aqueous medium.
- electrolytes are present in the aqueous media employed in most industrial applications, particularly those requiring the use of ground waters in subterranean formations as in enhanced oil recovery.
- the aqueous medium thickened with water-soluble polymer is exposed to temperatures in the range of 30° to 100° C. which normally causes reduction of viscosity.
- Such high temperatures are particularly common in enhanced oil recovery applications wherein the aqueous medium is pumped underground to depths of 5000 to 20,000 feet, as is common for mobility control fluids and packing fluids.
- cellulosic derivatives such as hydroxyethyl cellulose and biopolymers exhibit acceptable tolerance to the presence of electrolytes
- cellulosic derivatives are generally ineffective at the low concentrations that are economical and exhibit poor thermal stability.
- the biopolymers such as xanthan gums exhibit acceptable thermal stability, resistance to shear degradation and electrolytic tolerance.
- biopolymers are generally very expensive and are susceptible to biodegradation.
- the present invention is such a thickening agent which comprises (1) a water-soluble polymer having pendant hydrophobic groups and (2) a water-dispersible surfactant having hydrophobic groups that are capable of associating with the hydrophobic groups of the polymer.
- the relative proportions of the two components of the thickening agent are such that, when the thickening agent is dispersed in water in a concentration of 0.5 weight percent based on the water, the viscosity of the water is at least doubled.
- aqueous media containing the thickening agent of this invention can be subjected to substantial mechanical shear without a significant loss of viscosity.
- thickening agents provide a substantial viscosity increase even when the aqueous media contains significant concentrations of electrolyte as in the case of hard water or brine and even when exposed to temperatures up to 80° C. Consequently, such thickening agents can be used for a variety of applications wherein high temperatures, substantial electrolyte concentrations and conditions of high mechanical shear such as in high shear pumping of the aqueous medium is required.
- the thickening agents of the invention when dispersed in an aqueous medium, exhibit suitable plastic rheology and short solution characteristics.
- aqueous medium containing the thickening agent does not produce threads or strings of such aqueous medium when surfaces wetted with the medium are contacted and pulled apart.
- these thickening agents are useful in all applications which require aqueous media having increased viscosity such as drilling mud formulations, fracturing fluids, liquid mobility control agents, aqueous solutions of inorganic salts, hydraulic fluids, lubricants, friction reducing agents, suspending agents, aqueous suspensions of insoluble particulates such as paint formulations and the like.
- the present invention is an aqueous medium containing an amount of the thickening agent which is effective to increase the viscosity of the aqueous medium.
- the aqueous medium containing the thickening agent is a mobility control fluid useful in enhanced oil recovery operations.
- the thickened aqueous medium is introduced through an injection well into a porous subterranean formation penetrated by said well and driven through the formation through the producing well.
- the thickening agent is employed in a drilling mud formulation or a fracturing fluid wherein the thickening agent is present in an amount sufficient to increase the viscosity of the formulation or fluid as desired.
- the thickening agent of this invention contains (1) a water-soluble polymer having pendant hydrophobic groups and (2) a water-soluble dispersible surfactant.
- the hydrophobic groups of the polymer are solvated by the surfactant such that the thickening agent forms a solution in water.
- the water-soluble polymer is one which forms the thermodynamically stable mixture when combined with water. These mixtures form spontaneously and include true solutions in which the individual polymer molecules are dispersed as well as micellular or colloidal solutions wherein the polymer molecules are aggregated to some extent, but wherein such aggregates are no larger than colloidal size.
- the molecular weight of the water-soluble polymer is low enough such that an aqueous medium containing 0.1 weight percent of the polymer can be subjected to a degree of shear on the order of 10,000 sec -1 without causing the polymer to degrade significantly.
- the polymer has a molecular weight such that, when 0.5 weight part of the polymer is dissolved in 100 weight parts of water, the Brookfield viscosity of the water is increased to at least 2 centipoises (as measured using a Brookfield LVT viscometer equipped with a UL adaptor and operated at 6 rpm and 25° C.).
- the water-soluble polymers used in this invention have weight average molecular weights (M w ) as determined by gel permeation chromatography in the range from about 200,000 to about 5 million, most preferably from about 800,000 to about 2.5 million.
- the pendant hydrophobic groups of the water-soluble polymer are organic groups having hydrophobicities comparable to one of the following: aliphatic hydrocarbon groups having at least four carbons such as C 4 to C 20 alkyls and cycloalkyls; polynuclear aromatic hydrocarbon groups such as naphthyls; alkylaryls wherein alkyl has one or more carbons; haloalkyls of four or more carbons, preferably perfluoroalkyls; polyalkyleneoxy groups wherein alkylene is propylene or higher alkylene and there are at least 1 alkyleneoxy unit per hydrophobic moiety.
- the concentration of hydrophobic moieties in the water-soluble polymer is that which is sufficient to increase the viscosity of an aqueous medium containing the water dispersible surfactant.
- the concentration of hydrophobic groups in the polymer is such that, when one weight part of the polymer is dissolved in 100 weight parts of the aqueous medium containing one weight part of the surfactant, the Brookfield viscosity (as defined hereinbefore) of the aqueous medium is twice that of an aqueous medium containing 1 weight percent of the surfactant and 1 weight percent of a hydrophilic polymer that is identical in all respects to the hydrophobic polymer except that the hydrophilic polymer contains no hydrophobic groups.
- an aqueous solution containing 1 weight percent of a surfactant and 1 weight percent of polyacrylamide hydrophilic polymer
- a suitable hydrophobic polyacrylamide e.g., an acrylamide/dodecyl acrylate copolymer having a M w equivalent to the polyacrylamide
- Exemplary water-soluble polymers include the copolymers of water-soluble ethylenically unsaturated monomers with hydrophobic ethylenically unsaturated monomers wherein the concentration of hydrophobic monomer is sufficient to provide the requisite concentration of hydrophobic moieties.
- the water-soluble polymer is a copolymer from about 98 to about 99.995 mole percent of one or more water-soluble monomers with from about 0.005 to 2 mole percent of one or more hydrophobic monomers.
- preferred amounts of hydrophobic monomers will vary with the molecular weight of the polymer.
- a water-soluble polymer having a weight average molecular weight near 200,000 preferably contains from about 1 to about 2 mole percent of hydrophobic monomer.
- the water-soluble polymer having a weight average molecular weight of 2 million preferably contains from about 0.05 to about 0.25 mole percent of hydrophobic monomer.
- Suitable water-soluble monomers include those which are sufficiently water-soluble to form at least a 10 weight percent solution when dissolved in water and readily undergo addition polymerization to form polymers which are water-soluble.
- Exemplary water-soluble monomers include ethylenically unsaturated amides such as acrylamide, methacrylamide and fumaramide; their N-substituted derivatives such as 2-acrylamide-2-methylpropane sulfonic acid (AMPS), N-(dimethylaminomethyl)acrylamide as well as N-(trimethylammoniummethyl)acrylamide chloride and N-(trimethylammoniumpropyl)methacrylamide chloride; ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid and fumaric acid.
- AMPS 2-acrylamide-2-methylpropane sulfonic acid
- carboxylic acids such as acrylic acid, methacrylic acid, itaconic acid and fumaric acid.
- Ethylenically unsaturated quaternary ammonium compounds such as vinylbenzyl trimethyl ammonium chloride, sulfoalkyl esters of unsaturated carboxylic acids such as 2-sulfoethyl methacrylate; aminoalkyl esters of unsaturated carboxylic acids such as 2-aminoethyl methacrylate; vinyl amines such as vinyl pyridine and vinyl morpholine, diallyl amines and diallyl ammonium compounds such as diallyl dimethyl ammonium chloride; vinyl heterocyclic amides such as vinyl pyrrolidone; vinylaryl sulfonates such as vinylbenzyl sulfonate as well as the salts of the foregoing monomers.
- water-soluble monomers acrylamide and combinations of acrylamide and acrylic acid are preferred. Acrylamide and combinations thereof with up to 75 mole percent of acrylic acid, based on total water-soluble monomer, are more preferred. Most preferred are polymers wherein the water-soluble monomer is a mixture of acrylamide with from about 5 to about 50 mole percent, especially from about 15 to about 30 mole percent of acrylic acid.
- Suitable hydrophobic monomers are those which are water-insoluble, i.e., less than 0.2 weight part of the hydrophobic monomer will dissolve in 100 weight parts water.
- Exemplary hydrophobic monomers include the higher alkyl esters of ⁇ , ⁇ -ethylenically unsaturated carboxylic acids such as dodecyl acrylate, dodecyl methacrylate, tridecyl acrylate, tridecyl methacrylate, tetradecyl acrylate, tetradecyl methacrylate, octadecyl acrylate, octadecyl methacrylate, ethyl half ester of maleic anhydride, diethyl maleate, and other alkyl esters derived from the reactions of alkanols having from 8 to 20 carbon atoms with ethylenically unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic anhydride, fumaric acid
- alkyl esters of acrylic acid and methacrylic acid wherein alkyl has from 8 to 20 carbon atoms are preferred.
- the alkyl methacrylates wherein alkyl has from 10 to 20 carbon atoms are more preferred. Dodecyl methacrylate is the most preferred.
- the aforementioned water-soluble polymers containing hydrophobic moieties are advantageously prepared by copolymerizing the water-soluble monomers with hydrophobic monomers by any of the conventional polymerization techniques wherein the hydrophobic monomer or mixture of hydrophobic monomers is added with vigorous agitation to an aqueous solution of the water-soluble monomer or mixture of water-soluble monomers.
- the water-soluble monomer, as well as the hydrophobic monomer are soluble in a neutral organic solvent
- the water-soluble polymer can be prepared by any desired solution polymerization method wherein the neutral organic solvent is employed as the polymerization diluent.
- the most effective water-soluble polymers are prepared by copolymerizing the water-soluble monomers with hydrophobic monomers in a molar ratio of water-soluble monomer:hydrophobic monomer in the range from about 98:2 to about 99.995:0.005, preferably from about 99:1 to about 99.9:0.1.
- Polymerization of the water-soluble and hydrophobic monomers is advantageously effected in an aqueous medium containing an emulsifier for the hydrophobic monomer and a polymerization initiator capable of generating free-radicals.
- the emulsifier is required in most instances to suitably disperse the hydrophobic monomer and to subsequently obtain a copolymer having a uniform composition.
- a chain transfer agent may be included in the polymerization reaction mixture. Accordingly, it is desirable to employ from about 0.01 to about 0.1 weight percent of initiator based on the monomers and from about 0.1 to about 1 weight percent of emulsifier based on the monomers.
- Exemplary suitable polymerization initiators include the inorganic persulfates such as potassium persulfate, ammonium persulfate and sodium persulfate, azo catalysts such as azobisisobutyronitrile and dimethyl azoisobutyrate; organic peroxygen compounds such as benzyl peroxide, t-butyl peroxide, diisopropyl benzene hydroperoxide and t-butyl hydroperoxide. Of these initiators, the oil-soluble such as the organic peroxides and azo compounds are preferred.
- Suitable emulsifiers include anionic agents such as alkali metal salts of alkyl sulfates and alkyl and aryl sulfates, e.g., dodecyl alkyl sulfosuccinates and sodium dodecylbenzene sulfate; fatty acid soaps, e.g., sodium oleate, sodium stearate and potassium oleate; alkali metal salts of sulfonated fatty alcohols, e.g., sodium dodecyl sulfate; sulfates of ethoxylated alcohols; alkyl phosphate esters, e.g., dodecyl hydrogen phosphate; fluoro emulsifiers, e.g., perfluoroalkyl sulfates; and the like.
- anionic agents such as alkali metal salts of alkyl sulfates and alkyl and aryl sul
- cationic emulsifiers such as alkylamine hydrochlorides, e.g., dodecylamine hydrochloride and tridecylamine hydrochloride; quaternary alkyl or aryl ammonium halides such as dodecyl trimethyl ammonium chloride; ethoxylated fatty amines and other emulsifiers as described in McCutcheon's Detergents and Emulsifiers, North American Edition, 1980 Annual.
- an anionic emulsifier such as an alkali metal alkyl sulfate is preferably employed as the emulsifier.
- a cationic emulsifier such as dodecylamine hydrochloride is employed.
- a nonionic emulsifier such as nonylphenoxy polyethylene glycol having 10 ethyleneoxy units per molecule is suitably employed.
- the water-soluble polymers are readily recovered from the aqueous medium when such is desired by removal of water under vacuum or by azeotropic distillation. Alternatively, such polymers may be separated by the addition of methanol or anhydrous acetone to cause the water-soluble polymer to form a phase separate from the aqueous medium. As a further alternative, the aqueous medium containing the water-soluble polymer can be used as such.
- water-soluble polymers of acrylamide, acrylic acid and hydrophobic monomer can be prepared by copolymerizing all three of these monomers or by copolymerizing acrylamide with the hydrophobic monomer and subsequently hydrolyzing a portion of the copolymerized acrylamide by contacting the copolymer with a base such as sodium hydroxide and/or sodium carbonate.
- Surfactants suitably employed as a second component of the thickening agents of this invention are those micelle forming surface active agents which will disperse in an aqueous medium containing an effective amount of the aforementioned water-soluble polymer and which have sufficient hydrophobic moieties to combine with the water-soluble polymer to increase the viscosity of an aqueous medium containing said water-soluble polymer.
- such surfactants can be nonionic, anionic, cationic or amphoteric, with the nonionic surfactants being preferred due to their ability to remain hydrated in the presence of significant electrolyte concentration.
- Preferred nonionic surfactants have hydrophilic-lipophilic balances (HLB) in the range from about 2 to about 15, most preferably from about 5 to about 13.
- Exemplary surfactants include nonionic surfactants such as alkyl polyethyleneoxy compounds represented by the formula:
- R is C 8 -C 18 alkyl
- EO is ethyleneoxy
- n is a number from 1 to 10
- nonionic surfactants such as the reaction products of ethylene oxide or mixtures of ethylene oxide and higher alkylene oxide with active hydrogen compounds such as phenols, alcohols, carboxylic acids and amines, e.g., alkylphenoxyethyleneoxy ethanols.
- anionic substituted polyethyleneoxy compounds represented by the formula:
- R and n are as defined hereinbefore, EO is ethyleneoxy and X is SO 3 H or CO 2 H or PO 3 H; salts of long chain carboxylates such as potassium oleate, sodium laurate, potassium stearate, potassium caprolate, sodium palmatate and the like; alkali metal alkylbenzene sulfonates such as sodium nonylbenzene sulfonate and potassium dodecylbenzene sulfonate; alkali metal alkyl sulfates such as sodium dodecyl sulfate and alkali metal dialkyl sulfosuccinates such as sodium dihexyl sulfosuccinate and sodium dioctyl sulfosuccinate; salts of resin acids such as abietic acid and dihydroabietic acid.
- salts of long chain carboxylates such as potassium oleate, sodium laurate, potassium stearate, potassium caprolate, sodium palma
- cationic surfactants such as alkyl ammonium or quaternary ammonium salts, e.g., dodecyl ammonium hydrochloride, dodecyl trimethyl quaternary ammonium chloride and the like, and ethoxylated fatty amines.
- alkyl ammonium or quaternary ammonium salts e.g., dodecyl ammonium hydrochloride, dodecyl trimethyl quaternary ammonium chloride and the like, and ethoxylated fatty amines.
- oligomeric and polymerizable surfactants described at pages 319-322 of Blackley, Emulsion Polymerization Theory and Practice, John Wiley and Sons (1975).
- oligomers examples include ammonium and alkali metal salts of functionalized oligomers sold by Uniroyal Chemical under the trade name "Polywet” and copolymers of acrylonitrile and acrylic acid having molecular weights less than 2000 which are prepared in the presence of chain terminating agents such as n-octyl mercaptan.
- polymerizable surfactants include sodium salts of 9- and 10-(acrylylamido)stearic acid and the like.
- the nonionic types are preferred, with ethoxylated alkyl phenol and ethoxylated fatty alcohols being most preferred.
- the water soluble polymer is cationic, it is desirable to use a cationic or nonionic surfactant.
- anionic it is desirable to employ an anionic or nonionic surfactant.
- the thickening agent of the present invention is advantageously prepared by dispersing the water-soluble polymer and the surfactant in an aqueous medium under conditions such that the components are uniformly distributed throughout the aqueous medium.
- the surfactant is added to the polymerization recipe used to prepare the water-soluble polymer, and the recipe is then subjected to polymerization conditions.
- the surfactant is one which emulsifies the hydrophobic monomer in the aqueous polymerization medium and which increases the viscosity of an aqueous solution of the copolymer.
- the relative proportions of the water soluble polymer and the surfactant are not particularly critical, it is generally desirable to employ proportions such that associations between the hydrophobic moieties of the water-soluble polymer and the hydrophobic moieties of the surfactant are maximized. Accordingly, the critical micelle concentration of the surfactant and the number and size of the water-soluble polymer molecules are advantageously correlated such that the hydrophobic moieties of at least two molecules of the water-soluble polymer can associate with the hydrophobic moieties of each particle (micelle) of the surfactant.
- the ratio of surfactant to water-soluble polymer is one that produces a viscosity at least twice that of a solution containing only the water-soluble polymer.
- the weight ratio of water-soluble polymer to surfactant is from about 20:1 to about 0.5:1, most preferably from about 10:1 to about 1:1.
- the amount of total thickening agent in the aqueous medium being thickened is sufficient to provide the desired increase in viscosity of the aqueous medium.
- such amounts of thickening agent range from about 0.025 to about 5 weight percent, most preferably from about 0.5 to about 2.5 weight percent, based on the aqueous medium.
- the aqueous medium may contain a variety of other ingredients common to brines, fracturing fluids, drilling muds, paint formulations, lubricants, friction-reducing agents, suspending agents, liquid mobility control agents, hydraulic fluids and the like.
- Such aqueous media often contain from about 0.01 to about 20 weight percent of salts of alkali metals and alkaline earth metals.
- an aqueous medium containing substantial amounts, e.g., up to about 5 weight percent based on the aqueous medium, of monovalent inorganic salts such as sodium chloride and up to 1 weight percent, usually from 0.0015 to 0.5 weight percent, of salts of polyvalent cations such as calcium and magnesium it is preferred to employ (1) as the water-soluble polymer, (a) a nonionic copolymer of a water-soluble ethylenically unsaturated carboxamide such as acrylamide and a higher alkyl acrylate or methacrylate such as dodecyl methacrylate or (b) an anionic copolymer of sodium acrylate and higher alkyl acrylate or methacrylate, and (2) any suitable surface active agent as the surfactant.
- a nonionic copolymer of a water-soluble ethylenically unsaturated carboxamide such as acrylamide and a higher alkyl acrylate or methacrylate such as dodecyl
- the viscosity increase in this aqueous medium is retained at temperatures over the range from about 30° to about 80° C. In many instances, this viscosity increase is retained at temperatures substantially higher than 80° C., e.g., 275° C. and higher.
- a nonionic surfactant having an HLB greater than 10, e.g., a dodecyl ether of polyethylene glycol containing 10 ethyleneoxy units per surfactant molecule.
- nonionic or anionic copolymers with a nonionic surfactant having an HLB less than 10 such as the dodecyl ether of a polyethylene glycol having 2 ethyleneoxy groups per surfactant molecule.
- an aqueous medium containing from about 1 to about 5 weight percent of salts of polyvalent cations e.g., calcium and/or magnesium in the form of salts such as calcium bromide, calcium chloride or magnesium sulfate
- a nonionic surfactant especially a surfactant having an HLB greater than 10, e.g., the dodecyl ether of a polyethylene glycol having 5 ethyleneoxy groups per surfactant molecule.
- the type of application and the conditions characteristic of the application will determine the type and amount of surfactant employed, to give the desired viscosity response.
- a nonionic surfactant having a low HLB e.g., an HLB of 4 to 8
- a nonionic surfactant having a high HLB e.g., an HLB of 10-14
- the desired viscosity response for a given set of conditions can be achieved by adding a single surfactant having the desired HLB value or by adding a mixture of surfactants having different HLB values which combine to provide the desired HLB value.
- a 295 ml citrate bottle is charged with 25 g of an aqueous solution containing 10 percent of sodium dodecyl sulfate.
- a specified higher alkyl methacrylate monomer is then dispersed into aqueous solution by adding the monomer to the bottle and agitating the contents until emulsification of the monomer is achieved.
- Approximately 100 ml of deionized water is added with stirring followed by the addition of an aqueous solution containing specified water-soluble monomer.
- Aqueous solutions of a specified chelating agent and acetic acid are then added followed by the addition of isopropyl alcohol as a chain transfer agent.
- a solution of azobisisobutyronitrile (initiator) in t-butyl alcohol is added followed by addition of sufficient deionized water to increase the total contents (reaction mixture) of the bottle to 250 g.
- the contents of the bottle are degassed by alternate cycles (5-10 cycles) of vacuum and nitrogen gas purge.
- the bottle is then capped and heated in a water bath at 60° C. for 16 hours in an end-over-end apparatus thereby effecting copolymerization of the monomers.
- the contents of the bottles are cooled to room temperature and the polymer is removed from the bottle as a thick aqueous solution.
- water-soluble polymers of the water-soluble monomers which polymers do not contain the higher alkyl methacrylate are prepared according to the foregoing procedure except that the higher alkyl methacrylate is omitted. Also for comparison water-soluble polymers which contain lower alkyl acrylates are similarly prepared.
- [ ⁇ ] is intrinsic viscosity and M w is the weight average molecular weight of the polymer.
- aqueous solution of water-soluble polymer obtained in the foregoing manner is combined with a specified nonionic surfactant.
- the resulting solution is diluted with deionized water and slowly agitated overnight to obtain a uniform solution of the two component thickening agent of this invention.
- the specified nonionic surfactant is added to the citrate bottle with the aqueous solution of sodium dodecyl sulfate and the aforementioned polymerization procedure is carried out as described. Following this procedure, an aqueous solution of the two component thickening agent is recovered from the citrate bottle after polymerization is complete.
- Sample Nos. 16-20 show that an increase of C 12 MA from 0.1 to 0.25 (Polymer H) causes a substantial increase in viscosity of solutions containing relatively low electrolyte concentrations.
- Sample Nos. C 7 -C 12 show that addition of salt does not increase viscosity of aqueous solutions containing C 12 (EO) 5 surfactant and a polyacrylamide having an M w of about 800,000 (Polymer DD).
- aqueous solutions of AAM/C 12 MA (99.5/0.5) copolymer (Polymer I) and C 12 (EO) 5 surfactant retains much of its viscosity in the presence of significant salt concentrations and increase of temperature to 70° C. In fact, the ability of such solutions to undergo temperature increase without significant loss of viscosity is enhanced by increased concentrations of salt.
- an aqueous solution of polyacrylamide (Polymer DD) and the C 12 (EO) 5 surfactant undergoes a loss of viscosity when subjected to an increase in temperature.
- M w 200,000
- aqueous solutions of AAM/C 12 MA (99.9/1) copolymer (Polymer C) or AAM/C 12 MA (99.75/0.25) copolymer (Polymer F) and C 12 (EO) 5 surfactant which is present during polymerization exhibit increased viscosities when KCl is added to the solutions. Accordingly, it is shown that the surfactant can be added prior to polymerization. In contrast, as shown in Sample Nos. C 18 -C 21 , aqueous solutions of polyacrylamide and C 12 (EO) 5 surfactant which is present during polymerization do not exhibit increased viscosity where KCl is added to the solutions.
- aqueous solutions of AAM/C 12 MA (99.75/0.25) copolymer (Polymer F) and C 12 (EO) 5 surfactant which is present during polymerization exhibit substantial viscosity increases when salts of divalent cations such as CaCl 2 or MgSO 4 are added to the solutions. Such increases in viscosity are not obtained when such salts are added to aqueous solutions of polyacrylamide and C 12 (EO) 5 surfactant (Sample Nos. C 22 -C 26 ).
- aqueous solutions of AAM/C 12 MA/AA (49.9/0.1/50) copolymer (Polymer U) or AAM/C 12 MA/AA (74.9/0.1/25) copolymer (Polymer V) and C 12 (EO) 5 surfactant exhibit good retention of viscosity even upon addition of substantial amounts of KCl.
- aqueous solutions of AAM/AA (80/20) copolymer (Polymer FF) and C 12 (EO) 5 surfactant exhibit almost a total loss of viscosity as KCl is added to the solution.
Abstract
Description
RO(EO).sub.n --H
R--(EO).sub.n --X
[η]=(6.31×10.sup.-5)M.sub.w.sup.0.8
TABLE I __________________________________________________________________________ Polymerization Recipe Polymer Monomers, mole % NaDS.sup.1, AAM.sup.2, C.sub.x MA.sup.3, AA.sup.4, VA-AA.sup.5, IPA.sup.6, AZO.sup.7, C.sub.12 (EO).sub.5.sup .8, DI H.sub.2 O.sup.9, Designation AAM C.sub.x MA AA g g g g g g g g g __________________________________________________________________________ A 99.9 0.1 (x = 12) 0 25 49.95 0.0895 0 2.5 0 1.00 0 Make up to 250 g C 99.9 0.1 (x = 12) 0 25 49.95 0.0895 0 2.5 0 1.00 7.0 Make up to 250 g F 99.75 0.25 (x = 12) 0 25 49.88 0.2237 0 2.5 0 1.00 7.0 Make up to 250 g AA* 100 0 0 25 50 0 0 2.5 0 1.00 0 Make up to 250 g CC* 100 0 0 25 50 0 0 2.5 0 1.00 7.0 Make up to 250 g G 99.9 0.1 (x = 12) 0 25 49.95 0.0895 0 2.5 9.37 1.00 0 Make up to 250 g H 99.75 0.25 (x = 12) 0 25 49.88 0.2237 0 2.5 9.37 1.00 0 Make up to 250 g I 99.5 0.5 (x = 12) 0 25 49.75 0.447 0 2.5 9.37 1.00 0 Make up to 250 g DD* 100 0 0 25 50 0 0 2.5 9.37 1.00 0 Make up to 250 g K 99.5 0.5 (x = 12) 0 25 49.75 0.447 0 2.5 37.5 1.00 0 Make up to 250 g EE* 100 0 0 25 50 0 0 2.5 37.5 1.00 0 Make up to 250 g Q* 99.0 1.0 (x = 4) 0 25 49.5 0.5 0 2.5 0 1.00 0 Make up to 250 g R* 99.0 1.0 (x = 4) 0 25 49.5 0.5 0 2.5 9.37 1.00 0 Make up to 250 g S 99.9 0.1 (x = 8) 0 25 49.95 0.0697 0 2.5 0 1.00 0 Make up to 250 g T 99.9 0.1 (x = 8) 0 25 49.95 0.0697 0 2.5 9.37 1.00 0 Make up to 250 g U 79.9 0.1 (x = 12) 20 25 39.95 0.0895 10.14 2.5 0 1.00 0 Make up to 250 g V 49.9 0.1 (x = 12) 50 25 24.95 0.0895 25.34 2.5 0 1.00 0 Make up to 250 g FF* 80 0 20 25 40 0 10.14 2.5 0 1.00 0 Make up to 250 __________________________________________________________________________ g *Control watersoluble polymer having no hydrophobic moieties. .sup.1 NDS aqueous solution of 10 weight percent of sodium dodecyl sulfate (hydrophobic monomer emulsifiers). .sup.2 AAM aqueous solution of 50 weight percent of acrylamide and 17 pp of cupric ion inhibitor .sup.3 C.sub.x MA alkyl methacrylate wherein x is the number of carbons in the alkyl group. C.sub.12 MA dodecyl methacrylate C.sub.8 MA 2ethylhexyl methacrlate C.sub.4 MA nbutyl methacrylate .sup.4 AA aqueous solution of 50 weight percent of acrylic acid .sup.5 VA-AA aqqueous solution of 2 weight percent of pentasodium salt o (carboxymethylimino)bis(ethylenenitrilo)tetraacetic acid (chelating agent for Cu.sup. ++) and 16 weight percent of glacial acetic acid (pH control agent at pH of 3.8-4). .sup.6 IPA an aqueous solution of 20 weight percent of isopropyl alcohol (chain transfer agent). .sup.7 AZO a 1.25 weight percent solution of azobisisobutyronitrile in tbutyl alcohol. .sup.8 C.sub.12 (EO).sub.5 - dodecanol condensed with 5 moles of ethylene oxide (nonionic surfactant). .sup.9 DI H.sub.2 O deionized water is added to the polymerization recip until the total recipe weight is 250 g.
TABLE II __________________________________________________________________________ Post Added Polymer.sup.1 Surfactant.sup.2 Electrolyte.sup.3 Sample Concentration Concentration Concentration Temp. Viscosity.sup.4 No. Designation wt. % Type wt. % Type wt. % °C. cps __________________________________________________________________________ 1 A 0.25 C.sub.12 (EO).sub.5 0.25 None -- 25 12 (#2) 2 " " " " NaCl 1 " 130 (#2) 3 " " " " " 2 " 150 (#2) C.sub.1 ** AA* " " " None -- " 10 (#2) C.sub.2 ** " " " " NaCl 3 " 12 (#2) 4 A " C.sub.8 (EO).sub.5 + C.sub.18 (EO).sub.5 0.2 + 0.25 " -- 35 10 (#2) 5 " " " " " 1 " 29 (#2) 6 " " " " " 3 " 34 (#2) 7 " " C.sub.12 (EO).sub.5 0.25 " 1 30 105 (#2) 8 " " " " " " 40 80 (#2) 9 " " " " " " 50 " 10 " " " " " " 60 300 (#2) 11 " " " " " " 70 500 (#2) C.sub.3 ** AA* " " " " 1 35 12.0 (#2) C.sub.4 * " " " " " " 50 8 (#2) C.sub.5 ** " " " " " " 60 6 (#2) C.sub.6 ** " " " " " " 70 5 (#2) 12 G 0.5 " " None -- 25 4 (UL) 13 " " " " NaCl 1 " 18 (UL) 14 " " " " " 3 " 36 (UL) 15 " " " " " 5 " 44 (UL) 16 H " " " None -- " 4.4 (UL) 17 " " " " NaCl 2 " 730 (UL) 18 " " " " " 5 " 710 (UL) 19 " 1 " " " 1 " 1018 (UL) 20 " " " " " 5 " 982 (UL) C.sub.7 ** DD* 0.5 " " None -- " 3.3 (UL) C.sub.8 ** " " " " NaCl 1 " 4.2 (UL) C.sub.9 ** " " " " " 2 " 4.3 (UL) C.sub.10 ** " " " " " 5 " 4.8 (UL) C.sub.11 ** " 1 " " None -- " 8.0 (UL) C.sub. 12 ** " " " " NaCl 5 " 8.6 (UL) 21 I 0.5 " " " 2 23 700 (#2) 22 " " " " " " 40 500 (#2) 23 " " " " " " 50 380 (#2) 24 " " " " " " 60 330 (#2) 25 " " " " " 3 23 720 (#2) 26 " " " " " " 40 820 (#2) 27 " " " " " " 65 900 (#2) 28 " " " " " " 70 790 (#2) C.sub.13 ** DD* " " " " " 23 4.5 (UL) C.sub.14 ** " " " " " " 70 2.2 (UL) 29** Q* 0.2 " 0.08 " 1 25 5.6 (UL) 30** " " " " " 5 " 6.3 (UL) 31** R* 0.5 " 0.2 None -- " 4.5 (UL) 32** " " " " NaCl 1 " 4.9 (UL) 33** " " " " " 5 " 4.7 (UL) 34 S 0.2 " 0.08 " 1 " 8.1 (UL) 35 " " " " " 5 " 12.5 (UL) 36** T 0.5 " 0.2 " 1 " 5.2 (UL) 37** " " " " " 5 " " 38** K 2 None -- None -- " 24 (#2) 39 " " C.sub.12 (EO).sub.1 0.2 " -- " 40 (#2) 40 " " " 0.5 " -- " 280 (#2) 41 " 1 " " " -- " 80 (#2) 42 " " " 1.0 " -- " 680 (#2) 43 " 1.5 " 0.5 " -- " 120 (#2) 44 " " " 1.0 " -- " 2240 (#2) C.sub.15 ** EE* 2 None -- " -- " 3-5 (#2) C.sub.16 ** " " C.sub.12 (EO).sub.1 0.2 " -- " 5 (#2) C.sub.17 ** " " " 1.0 " -- " 6.5 (#2) 45 C 0.5 None -- " -- 23 37.5 (UL) 46 " " " -- KCl 1 " 157.5 (UL) 47 " " " -- " 2 " 200 (UL) 48 " 0.25 " -- None -- " 20 (UL) 49 " " " -- KCl 1 " 35 (UL) 50 " " " -- " 2 " " 51 F 0.5 " -- None -- " 37.5 (UL) 52 " " " -- KCl 1 " 1675 (UL) 53 " " " -- " 2 " 2150 (UL) 54 " 0.25 " -- None -- " 25 (UL) 55 " " " -- KCl 1 " 200 (UL) 56 " " " -- " 2 " 250 (UL) C.sub.18 ** CC* 0.5 " -- None -- " 19.5 (UL) C.sub.19 ** " " " -- KCl 2 " 23.5 (UL) C.sub.20 ** " 0.25 " -- None -- " 6.0 (UL) C.sub.21 ** " " " -- KCl 2 " 7.0 (UL) 57 F 1 " -- None -- 22 200 (#2) 58 " " " -- CaCl.sub.2 2 " >5000 (#2) 59 " 0.5 " -- " 1 " 1100 (#2) 60 " 0.25 " -- " 0.5 " 75 (#2) 61 " " " -- " 5 " 200 (#2) 62 " " 41 -- " 10 " 495 (#2) 63 " 0.125 " -- " 5 " 20 (#2) 64 " 0.5 " -- MgSO.sub.4 1 " 750 (#2) 65 " 0.25 " -- " " " 75 (#2) 66 " " " -- " 5 " 162 (#2) 67 " " " -- " 10 " 1850 (#2) C.sub.22 ** CC* 0.5 " -- CaCl.sub.2 1 " 30 (#2) C.sub.23 ** " 0.25 " -- " 5 " 10 (#2) C.sub.24 ** " " " -- " 10 " " C.sub.25 ** " 0.5 " -- MgSO.sub.4 2 " " C.sub.26 ** " " " -- " 10 " " 68 U 0.125 C.sub.12 (EO).sub.5 0.0625 None -- 25 610 (#2, pH 7.5) 69 " " " " KCl 2 " 900 (#2, pH 7.5) 70 " " " " " 5 " 500 (#2, pH 7.5) 71 " " " " " 10 " 325 (#2, pH 7.5) 72 V 0.1 " 0.05 None -- " 660 (#2, pH 7.5) 73 " " " " KCl 3 " 900 (#2, pH 7.5) 74 " " " " " 5 " 625 (#2, pH 7.5) 75 " " " " " 10 " 400 (#2, pH 7.5) 76 " 0.0625 " 0.031 None -- " " 77 " " " " KCl 1 " 48 (#2, pH 7.5) C.sub.27 ** FF* 0.25 " 0.125 None -- " 1100 (#2, pH 7.5) C.sub.28 ** " " " " KCl 2 " 30 (#2, pH 7.5) C.sub.29 ** " " " " " 4 " 25 (#2, pH 7.5) C.sub.30 ** " " " " " 10 " " C.sub.31 ** " 0.0625 " 0.031 None -- " 250 (#2, pH 7.5) C.sub.32 ** " " " " KCl 1 " 4 (#2, pH __________________________________________________________________________ 7.5) *Control watersoluble polymer having no or insufficient hydrophobic moieties. **Not an example of the invention. .sup.1 Polymer designation as specified in Table I. Concentrations of polymer in weight percent based on total aqueous solution. .sup.2 Post added surfactant means surfactant added to aqueous solution o polymer after (post) polymerization is completed. C.sub.12 (EO).sub.5 - dodecanol condensed with 5 moles of ethylene oxide (nonionic surfactant). C.sub.8 (EO).sub.5 - octanol condensed with 5 moles of ethylene oxide (nonionic surfactant). C.sub.18 (EO).sub.5 - octadecanol condensed with 5 moles of ethylene oxide (nonionic surfactant). C.sub.12 (EO).sub.1 - dodecanol condensed with a mole of ethylene oxide (nonionic surfactant). Concentration of surfactant is weight percent based on total aqueous solution. .sup.3 Concentration of electrolyte (salt) is weight percent based on total aqueous solution. .sup.4 Brookfield viscosity is measured using a Brookfield LVT viscometer operating at specified temperature and using a UL adaptor or #2 spindle a specified in the parenthesis rotating at 6 rpm.
Claims (36)
RO(EO).sub.n H
RO(EO).sub.n --H
Priority Applications (17)
Application Number | Priority Date | Filing Date | Title |
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US06/232,327 US4432881A (en) | 1981-02-06 | 1981-02-06 | Water-dispersible hydrophobic thickening agent |
CA000394913A CA1171188A (en) | 1981-02-06 | 1982-01-26 | Water-dispersible hydrophobic thickening agent |
NZ199574A NZ199574A (en) | 1981-02-06 | 1982-01-27 | Thickening agent for aqueous liquids containing polymer and surfactant |
AU79906/82A AU553081B2 (en) | 1981-02-06 | 1982-01-27 | Thickening composition |
EP82100633A EP0057875B1 (en) | 1981-02-06 | 1982-01-29 | Water-dispersible hydrophobic thickening agent |
DE8282100633T DE3276437D1 (en) | 1981-02-06 | 1982-01-29 | Water-dispersible hydrophobic thickening agent |
ZA82686A ZA82686B (en) | 1981-02-06 | 1982-02-03 | Water-dispersible hydrophobic thickening agent |
MX191289A MX159228A (en) | 1981-02-06 | 1982-02-04 | THICKENING COMPOSITION FOR AQUEOUS LIQUIDS |
IN137/CAL/82A IN156183B (en) | 1981-02-06 | 1982-02-04 | |
PH26831A PH20903A (en) | 1981-02-06 | 1982-02-05 | Water-dispersible hydrophobic thickening agent |
OA57606A OA07011A (en) | 1981-02-06 | 1982-02-05 | A hydrophobic thickening agent dispersible in water and a thickened aqueous composition obtained with this agent. |
JP57016466A JPS57155280A (en) | 1981-02-06 | 1982-02-05 | Water-dispersible hydrophobic thickener |
NO820350A NO159677C (en) | 1981-02-06 | 1982-02-05 | THICKNESS MIXING AND USING IT. |
BR8200657A BR8200657A (en) | 1981-02-06 | 1982-02-05 | HYDROPHOBIC THICKENING AGENT DISPERSIBLE IN WATER |
EG55/82A EG15906A (en) | 1981-02-06 | 1982-02-06 | Water disperible hydrophol tiening agent |
KR8200512A KR850001784B1 (en) | 1981-02-06 | 1982-02-06 | Water-dispersible hydrophobic thickening agent |
US06/518,877 US4814096A (en) | 1981-02-06 | 1983-08-01 | Enhanced oil recovery process using a hydrophobic associative composition containing a hydrophilic/hydrophobic polymer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US06/232,327 US4432881A (en) | 1981-02-06 | 1981-02-06 | Water-dispersible hydrophobic thickening agent |
Related Child Applications (1)
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US06/518,877 Continuation-In-Part US4814096A (en) | 1981-02-06 | 1983-08-01 | Enhanced oil recovery process using a hydrophobic associative composition containing a hydrophilic/hydrophobic polymer |
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US4432881A true US4432881A (en) | 1984-02-21 |
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Application Number | Title | Priority Date | Filing Date |
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US06/232,327 Expired - Lifetime US4432881A (en) | 1981-02-06 | 1981-02-06 | Water-dispersible hydrophobic thickening agent |
Country Status (16)
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US (1) | US4432881A (en) |
EP (1) | EP0057875B1 (en) |
JP (1) | JPS57155280A (en) |
KR (1) | KR850001784B1 (en) |
AU (1) | AU553081B2 (en) |
BR (1) | BR8200657A (en) |
CA (1) | CA1171188A (en) |
DE (1) | DE3276437D1 (en) |
EG (1) | EG15906A (en) |
IN (1) | IN156183B (en) |
MX (1) | MX159228A (en) |
NO (1) | NO159677C (en) |
NZ (1) | NZ199574A (en) |
OA (1) | OA07011A (en) |
PH (1) | PH20903A (en) |
ZA (1) | ZA82686B (en) |
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OA07011A (en) | 1983-03-31 |
DE3276437D1 (en) | 1987-07-02 |
EP0057875A2 (en) | 1982-08-18 |
EG15906A (en) | 1987-04-30 |
BR8200657A (en) | 1982-12-14 |
MX159228A (en) | 1989-05-08 |
IN156183B (en) | 1985-06-01 |
PH20903A (en) | 1987-05-27 |
EP0057875B1 (en) | 1987-05-27 |
JPS57155280A (en) | 1982-09-25 |
KR850001784B1 (en) | 1985-12-18 |
JPH023435B2 (en) | 1990-01-23 |
EP0057875A3 (en) | 1982-12-29 |
NZ199574A (en) | 1985-07-31 |
CA1171188A (en) | 1984-07-17 |
NO159677C (en) | 1989-01-25 |
KR830009348A (en) | 1983-12-19 |
NO159677B (en) | 1988-10-17 |
AU7990682A (en) | 1982-08-12 |
AU553081B2 (en) | 1986-07-03 |
ZA82686B (en) | 1983-09-28 |
NO820350L (en) | 1982-08-09 |
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